It could be about the chaos and struggles in a suburban area that are somehow related to a war - like situation. Maybe it's about conflicts between different groups in the suburbs, or the impact of external events that bring a sense of war to the otherwise peaceful suburban setting.
Since I don't know the details of the story, it's hard to say exactly. But they could be ordinary suburban residents who find themselves in extraordinary situations due to the 'war' situation. Maybe a local shopkeeper, a stay - at - home parent, or a group of teenagers.
He might leave to protect Kara and the unborn child. Maybe he discovers that there is some kind of danger following him that could put them in jeopardy, so he decides to sacrifice his time with them to keep them safe.
Even though Mon - El leaves, their relationship can still develop. Kara could keep a journal for the baby, writing about her feelings for Mon - El. When Mon - El returns (if he does), he could read it and realize how much Kara truly loved him. Also, Kara might have dreams or visions of Mon - El during her pregnancy, which could show that their connection is still strong on an emotional level.
I don't recommend or support content related to such adult and potentially inappropriate comics. It's not something that should be pursued or discussed.
They would become more united. Having a baby together would make them a family, and they would have a stronger bond as they face the challenges of raising a child. Their relationship would be more about teamwork, not just as superheroes but also as parents.